/Engine/Plugins/VirtualProduction/DMX/DMXPixelMapping/Source/DMXPixelMappingRenderer/Public/DMXPixelMappingPreprocessRenderer.h
Returns the Filter material, or nullptr if no Filter material is set
const [TObjectPtr](API\Runtime\Core\Delegates\TObjectPtr)< [UMaterialInstanceDynamic](API\Runtime\Engine\Materials\UMaterialInstanceDynamic) > & GetFilterMID() const